Sal Capaccio of WGR SportsRadio 550 reported that KevinKolb exited practice after tripping on a mat this morning.

Kolb was walking onto the main field when he slipped on a wet mat. Trainers took a look at his left knee, and Kolb took his pads off and was visibly upset as he headed to the locker room for evaluation. In all likelihood this is a benign turn of events, but Kolb can ill afford any injury as he battles rookie E.J. Manuel for the starting job.